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Hunter head adjustment.

Hi,
I'm new to this watering world and would appreciate any advice.
System is rather recent and so far no problems.
I have a couple of Hunter pop up heads that I'd like to adjust (they're overshooting the desired area). I just got the adjusting tool but no instructions. Any special procedure?
Does Hunter have any pamphlet/booklet out that covers operation/maintenance for the overall system? (winterizing/spring startup).
Thanks for any help you can offer.